package cj.web.login.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import net.paoding.rose.web.annotation.Path;
import net.paoding.rose.web.annotation.rest.Get;
import cj.web.uc.controller.BaseController;

/**
 * 验证码
 * @author Administrator
 *
 */
@Path("auth")
public class AuthCodeController extends BaseController{
	
	@Get("authCode")
	public void getAuthCode(HttpServletRequest request,
			HttpServletResponse response, HttpSession session)
			throws IOException {
		int width = 63;
		int height = 37;
		Random random = new Random();
		// 设置response头信息
		// 禁止缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);

		// 生成缓冲区image类
		BufferedImage image = new BufferedImage(width, height, 1);
		// 产生image类的Graphics用于绘制操作
		Graphics g = image.getGraphics();
		// Graphics类的样式
		g.setColor(this.getRandColor(200, 250));
		g.setFont(new Font("Times New Roman", 0, 28));
		g.fillRect(0, 0, width, height);
		// 绘制干扰线
		for (int i = 0; i < 155; i++) {
			g.setColor(this.getRandColor(50, 200));
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int x1 = random.nextInt(12);
			int y1 = random.nextInt(12);
			g.drawLine(x, y, x + x1, y + y1);
		}

		// 绘制字符
		String strCode = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			strCode = strCode + rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 28);
		}
		// 将字符保存到session中用于前端的验证
		session.setAttribute("strCode", strCode);
		
		g.dispose();

		ImageIO.write(image, "JPEG", response.getOutputStream());
		response.getOutputStream().flush();

	}

	private Color getRandColor(int fc,int bc){
        Random random = new Random();
        if(fc>255)
            fc = 255;
        if(bc>255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r,g,b);
    }
}
